When I started my career 17 years ago, only a few geothermal-unit configurations were available, and those met most industry needs. With the inception of the LEED (Leadership in Energy and Environmental Design) green-building rating program and stricter ANSI/ASHRAE/IES Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, and ANSI/ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality, requirements, the geothermal industry has evolved. This article provides an overview of the wide array of geothermal options available to design engineers and commercial-building owners seeking to sharply reduce operating costs.
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